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<h2>Introduction</h2>
<p>
A 0install application is distributed using a <i>feed file</i>. A feed is an XML
file that tells 0install how to run the application, and which versions are
available. The feed file is normally published on the web; the URL of the
feed is the unique identifier of the application.
</p>
<p>
For example, OpenTTD is available via 0install, it has
<a href='http://repo.roscidus.com/games/openttd'>this
feed file</a> and it is uniquely identified as
<a href='http://repo.roscidus.com/games/openttd'>
http://repo.roscidus.com/games/openttd</a>.
</p>
<p>
To get a 0install application:
<ol>
<li>
<p>
Find a program you want to run on the web:
</p>
<p>
<img src='screens/find-url.png' alt='' width='400' height='314'/>
</p>
</li>
<li>
<p>
Either launch it directly:
</p>
<pre>$ <b>0launch http://repo.roscidus.com/games/openttd</b></pre>
<p>
Or <a href='user-guide-shortcuts.html'>generate a shortcut</a> to launch it later:
</p>
<p>
<img src='screens/add-url.png' alt='' width='400' height='364'/>
</p>
</li>
</ol>
</p>
<p>
Upon first launch of a feed, 0install may ask you to accept keys and be
allowed to download files.
</p>
<quicklinks>
<link href='user-guide-first-launch.html' img='tango/go-next.png'>Continue</link>
</quicklinks>
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